Question
If $K_a \phi=1.1 \mathrm{~Wb}$, determine the speed of the motor in problem 15.8.
Step 1
The speed of the motor can be determined using the formula that relates the back electromotive force (EMF) to the flux linkage and the speed of the motor. Show more…
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A shunt-connected de motor has $K \phi=$ 1 $\mathrm{V} /(\operatorname{rad} / \mathrm{s}), R_{A}=1.2 \Omega,$ and $V_{T}=200 \mathrm{V}$ Find the two speeds for which the developed power is 5 hp. Neglect field loss and rotational loss. Find the value of $l_{A}$ and efficiency for each speed. Which answer is most likely to be in the normal operating range of the machine?
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